Surfacing machine



'June 2, I942. c. INMAN 2,285,377

SURFAC ING MACHINE Filed June 27, 1959 4 sh'eets-sheei 1 June 2, 1942.J, c, INMAN sunmcme MACHINE Filed June 27, 1939 4 Sheets-Sheet '2ITLUEH't-UI' June 1942. J. c. INMAN 2,285,377

SURFAC ING MACHINE Filed June 27, 1939 4'Sheets-She et 3 Patented June2, 1942 mer e rarest orriacs SURFACING MACHINE John Clarence Inman,Windsor, Ontario, Canada, assignor to Lempco Products, 1110., Bedford,Ohio, a corporation of Ohio Application June 27, 1939, Serial No.281,425

20 Claims. (01. 51151) My invention relates to improvements in surfacingmachines for surfacing or resurfacing the gasket engaging faces ofcylinder heads or blocks, the faces of clutch pressure plates, and othersurfaces which it is desired to grind true.

An object of my invention is to devise a machine which will hold theWork, a surface of which is to be ground, exerting pressure thereon topress it down against an abrasive plate and move it over such plate toeffect the grinding operation.

A further object is to devise a machine which will impart to the workcombined longitudinal and lateral movement so that the path travelled byany point in the work will be in the form of a figure eight for eachcycle of movement.

And a still further object is to provide means, in the case where themachine is to be used for grinding the surfaces of clutch pressureplates, whereby in addition to the figure eight movement a progressiverotary motion will be imparted to the work.

With the, above and other objects in View which will hereinafter appearas the specifica- 0 tion proceeds, my invention, in its preferredembodiment, consists in the construction and arrangement hereinaftermore particularly described and illustrated in the accompanying drawingsin which:

Fig. 1 represents a side view of the machine with the near side removedto expose the drive and abrasiveplate to view.

Fig. 2 is a plan view thereof.

Fig. 3 is an inverted sectional plan view taken on the line 3-3 (Fig.1).

Fig. 4 is an enlarged end elevational view, showing the mechanism forimparting the lateral movement to the work (in this case a cylinderhead) illustrated in dotted lines.

Fig. 5 is a similarly enlarged plan View of the mechanism shown in Fig.4.

Fig. 6 is an end elevational detail (drawn to a slightly larger scalethan Figs. 1 and 2) illustrating the mechanismfor imparting progressiverotary motion to the work.

Fig. '7 is 'a horizontal section taken on the line 'l'! (Fig. 6).

Fig. 8 is a horizontal section taken on the line 8--8 (Fi 6).

Fig. 9 is asim'ilar section to that shown in Fig. 8 only illustratingthe parts in different positions. v

Fig. 10 is an enlarged inverted plan view of the set'screws 24.

the mechanism for imparting progressive rotary 'motion to the work, and

Fig. 11 is an enlarged/vertical section taken through the line II'H(Fig. 7).

Like characters of reference indicate corresponding'parts in thedifierent views of the drawings.

Where the machine is tobe used for surfacing or resurfacing clutchpressure plates the mechanism for imparting progressive rotary motion tothe work is. incorporated thereinto as well as the mechanism forimparting the figure eight movements whereas Where the machine isintended for use for grinding cylinder heads'or blocks only themechanism for imparting the figure eight movements is employed and themechanism for imparting progressive rotary motion to the work isomitted.

I will first describe the machine which includes all the mechanismnecessary to surface or resurface a cylinder head or block.

A table [2 is provided having a planary top 13 preferably covered by asheet of resilient material 14 such as sponge rubber. The abrasive 1plate l5 rests on the sheet l4 and may assume the form described andclaimed in my co-pending application Serial No. 279,890, filed June 19-,1939, for improvements in Cylinder head and. block surfacing'plates inwhich the plate is covered by aband of abrasive material such as emerycloth.

Upwardly extending flanges 16 are provided- '7 on the table l2 toproperly position the abrasive plate I5.

The mechanism for imparting the figure eight movements to the' work,whether clutch pres sure plate or cylinder head or block, comprisesspaced apart slide rods ll longitudinally disposed under the table topand supported at their" ends in spaced relation thereto in the dependingbrackets l8. rods I! and standards 20 extend upwardly from the sides ofthe slide at the sides of the table.

Blocks 2! having depending sockets 22 receive the upper portions of thestandards 20' and have spaced laterally disposed slide rods 23 extendingtransversely fromblock to block,

said blocks being vertically adjustable onthe standards and held in anyadjusted position by 23, said slide having an aperture 26 therethrough.

extending to the vicinity of one end.- thereof, which apertureterminates at its inner end in A slide 19 is reciprocable on the athroat 21 of reduced width. An upwardly directed extension 28 isprovided on the slide 25 in the vicinity of itsend remote from theaperture 26, said extension and throat 21 being preferably located onthe longitudinal centre line of the slide. A bracket 28 provided at oneend with a socket 30 located over the aperture 26 has its other endprovided with a longitudinal slot 31 adapted to receive the flattenedupper end 32 of a pin 33 which extends down freely through the extension28 and slide 25 and protrudes below the latter through a double armedmember 34 which is held thereon by a nut 35 threaded onto the lower endof such pin 33, said pin being a driving fit in the member 34. bracket29 is held on the upper end of the pin 33 by a bolt 36 threadedthereinto.

The socket 38 on the bracket 29 has a vertical spindle 31 threadedtherethrough and extending downwardly into the vicinity of the work. Thelower end of the spindle is provided with a stiff spiral spring 38which, at its lower extremity, carries a flanged member 39 provided witha hardened steel point 40 adapted to engage the work A or B (illustratedin dotted lines in Figs. 4 and as a cylinder headand in full lines inFigs. 1 and 2 as a clutch pressure plate). A look nut 4| is provided onthe spindle 3? adapted to engage the upper end of the socket 3i] and theupper end of such spindle terminates in. a knob 42 for facilitatingrotation thereof.

The double armed member 34 provided with opposed arms 43 havinglongitudinal slots 44 The.

nuts 68.

therethrough is provided with an extension 45 extending inwardlysubstantially perpendicularly to the arms. Such extension carries at itsfree extremity an upwardly directed pin 45 adapted to extend up throughthe throat 21 in the slide aperture 26 and protrude thereabove. A pawl41 pivoted on the upper end of the pin 46 is adapted to engage a ratchetwheel 48 rotatably mounted on the slide 25 between the extension 28 andthe throat 21, said pawl being spring held against the ratchet wheel byaspring 49, one end of which is attached to the upper end of the pin 45and the other end to the pawl. An additional spring-held detent 58similar to the above pawl and spring is provided on the slide 25engageable with the ratchet wheel 48 to prevent retrograde rotationthereof when the pawl 41 is ratcheting as will hereinafter appear.

A crank 5! curved to escape the spindle 31 is pivoted at one end by astud 52 to the ratchet wheel 48 in the vicinity of its periphery and atits opposite end by a bolt 53 to a clamp adjustably mounted on the sliderods 23, said clamp comprising upper and lower members 54, 55 securedtogether by the bolt'53 upon the lower end of which a nut 56 isthreaded.

Where the machine is used for ri d g y der heads, for instance, headedstuds 51 extend down through the slots 44 in the arms 43 of the Theslide I 5 is reciprocated by any suitable mechanism and prime mover as,for instance, by an electric motor 6| attached to a bed 62 which may beclamped to the slide rods H, the motor having an armature shaft pulley63 connected by a belt 64 to a shaft pulley 65 of a reduction gear 65mounted beneath the top of the table [2 and which includes a powertake-01f crank 61 pivotally connected at .its free end to one end of alink 68 which is pivotally connected at its other end to the slide IS.

The mechanism as above described is all that is required for impartingthe necessary movement to cylinder heads and blocks to surface orresurface their gasket engaging faces. Where, however, the machine is tobe used for grinding the face of a clutch pressure plate the latter isheld in position relatively to the actuating mechanism by other meanswhich will hereinafter be described and in addition to the figure eightmotion of the work to be ground means is provided for progressivelyrotating the clutch pressure plate.

Instead of the studs 51 which are not used, a member 69, asillustrated'a forked member, is attached .to the double armed member 34by headed bolts 18 extending through the slots 44 into the freeextremities of the legs of the member 69, said latter member straddlingthe extension 45 but positioned below the same.

At the junction of the legs of the member 69 an orifice H is provided toreceive loosely the head 12 of a stud 73 of a chuck employed to hold theclutch pressure plate in position while grinding its face. Such looseconnection between-the chuck stud and member 69 constitutes a pivotalconnection enabling the chuck and attached work to align itself with theabrasive plate. Such chuck may be of any orthodox form and asillustrated consists of a cylindrical casing 74 having radial jawguideways 1-5 in its bottom adapted to receive the outwardly movablejaws 16 disposed therein, said jaws adapted to extend through orificesin the casing side wall and to engage the inner periphery of the clutchpressure plate which is designated as A. The upper faces of the jaws T8are provided with transverse curved teeth 11 inserted into a spiral rack18 on the lower face of a disc I9 disposed concentrically in t e cas nsaid disc having radially disposed teeth 88 in its upper surfaceengageable with pinions 8| on horizontal stubs 82 journalled in thecasing side wall and extending to the exterior face thereof. The outerends of the stubs are of socket form to receive a key (not shown). Aflanged plate 83 fits inside the casing 14 above the disc 19 and hasnotches 84 in its flange which straddle the reduced portions 82a of thestubs 82 to prevent the latter being displaced inwardly or outwardly.The flanged plate 83 has a depending central boss 85 resting on thebottom of the chuck casing. The hereinbefore mentioned stud 13 isdisposed axially of the chuck by being mounted on a cover plate 86 whichis secured to the wall of casing 14 by the screws 81. The cover plate isof greater diameter than the casing and its periphery is provided with atoothed rack 88.

A depending stud 89 is provided on the slide 25 by having its upper" endinserted into an orifree 88 therein and held in place by a set screwrack 88 by a spiral spring 93 attached at one end to the pawl and at theother end to the stud.

In order to provide longer jaws in the case where the inner periphery ofthe clutch pressure plate or ring is of excessive diameter, asillustrated in Figure 10 the jaws 16 may have extensible portions 16asecured to the jaws proper by screws 94.

I will now describe the operation of my machine in so far as thegrinding of a cylinder head is concerned, reference being hadparticularly to Figs. 4 and 5 of the drawings, it being understood thatthe clutch pressure plate holding chuck and the means for supporting itand rotating it have been removed.

The abrasive plate as illustrated or any other suitable form of abrasiveplate is placed in position on the table 12 as shown and the cylinderhead designated by B is placed thereon, the slide 25 and its attachedmechanism having previously been raised on the standards sufficiently toenable the abrasive plate and cylinder head to be placed in position.The slide and its attached mechanism are now lowered until the studs 51,having been suitably adjusted in the slots 44, are inserted into thebolt holes in the cylinder head B. The set screws 24 are then screwed into lock the blocks 2| on the standards. By loosening the clamps for thecrank 5| the cylinder head and the slide 25 can be suitably adjusted forproper lateral centering, the clamp for the crank 5! being thentightened on the slide rods 23. Subsequently the spindle 31 is screweddown in the socket by the knob 42 until the hardened point 40 engagesthe upper surface of the cylinder head and the spring 38 exerts sumcientpressure thereon to press the surface to be ground of the cylinder headagainst the abrasive plate.

The electric motor 5| is then switched on and through the medium of thepulleys 63 and 65 and belt 64 the reduction gearing 36 is operated andits crank 6! is rotated with the result that the longitudinal slide I9is reciprocated by the crank connected link 68. As the work to beground, i. e., the cylinder head B is connected to the longitudinalslide l9 through the standards 20, lateral slide rods 23, lateral slide25, double armed member 34 and studs 51 on its arms 43, the work isreciprocated longitudinally upon the reciprocation of the longitudinalslide I9.

Simultaneously during each longitudinal reciprocation the work is alsomoved laterally, this occurring upon the longitudinal movement of thework in the direction indicated by the arrow X in Fig. 5. Owing to thelag of the work due to the friction of its surface to be ground on theabrasive plate and the pressure exerted by the spring 38, such worktends to turn about a point underlying the pivot pin 33 in the directionof the arrow Y in Fig. 5. This is due to the 01T- setting of the pivotpin 33 from the longitudinal centre line of the work. As this occurs themember 34 attached to the work swings in the same direction until thestud engages a side wall of the throat 21 which limits such swingingmovement. During such swing the pawl 41 on the stud 45 engaging theratchet wheel 48 rotates the same in a counter-clockwise direction andactuates the crank 5| with the result that the slide 25 and attachedwork is moved laterally.

During the longitudinal movement of the work in the reverse direction tothat indicated by the arrow X in Fig. 5, the work tends to turn in thereverse direction to that indicated by the arrow Y in Fig. 5 with theresult that the member 34 is swung back in such direction until the stud45 engages the opposite side wall of the throat 21. During such swingthe pawl merely ratchets on the ratchet wheel 48 and no lateral movementis imparted to the lateral slide 25 and therefore to the work.

The result of such combined longitudinal and lateral movement of thework including the swing thereof is that any point of the work willduring a complete cycle of such movements describe a figure eight path.Owing to the fact that on each longitudinal reciprocation of the workthe lateral movement thereof is comparatively small it will take severallongitudinal reciprocations for the work to travel completely across theabrasive plate in either direction. Thus successive figure eight pathsdescribed by any point in the work will not register but will beprogressively positioned across such plate.

Consequently owing to the combined movements imparted to the work as itssurface is ground against the abrasive plate, such ground surface willbe in a true plane.

In the case where it is desired to grind the surface of a clutchpressure plate A as illustrated in Figs. 1 and 2 the studs 51 are notused and the clutch pressure plate holding mechanism above described isemployed. In so far as the combined longitudinal and lateral movementsimparted to the work by the slides l9 and 25 are concerned these areidentical to the above case in which the cylinder head surface is groundbut, in addition, the clutch pressure plate is progressively rotated.Each time the clutch pressure plate A commences its longitudinal strokein the direction of the arrow X in Fig. 5 owing to the lag of the workand the offsetting of the pivot pin 33 the member 34 is turned in thedirection of the arrow Y as above described with the result that therelative position of the lateral. slide 25 and clutch pressure plateholding chuck are altered, the slide 25 being advanced with respect tothe chuck. As the pawl 92 is positioned on the slide 25, during such lagof the work and the chuck the pawl 92 engaging the rack 88 on the chuckwill turn the chuck a limited extent and consequently equivalentlyrotate the clutch pressure plate. On the reverse longitudinal stroke thepawl 92 merely ratchets on the rack. The disposition of the parts of themechanism effecting such operations are shown in Figs. 8 and 9 whereinthe latter figure illustrates the relative movement of member 34 andchuck to effect the turning of the latter and the former figure showstheir relative positions on the reverse longitudinal stroke.

.What I claim as my invention is:

1. In a machine for truing plane surfaces on cylinder heads and blocksand on clutch pressure plates, the combination with an abrasive surfaceupon which the work to be ground rests, of a longitudinally reciprocableslide, means for reciprocating the slide, means attached to the slidefor holding the work pivotally from a point offset from its longitudinalcentre line, said work reciprocating longitudinally on the abrasivesurface with the longitudinal reciprocation of the slide, and means formoving the work laterally on the abrasive surface during each cycle oflongitudinal reciprocation thereof.

2. In a machine for truing plane surfaces on cylinder heads and blocksand on clutch pressure plates, the combination with an abrasive surfaceupon which the work to be ground rests, of a longitudinally reciprocableslide, means for reciprocating the slide, means attached to the slidefor holding the work pivotally from a point offset from its longitudinalcentre line, said work reciprocating longitudinally on the abrasivesurface with the longitudinal reciprocation of the slide, and meansactuated by the swinging of the workabout the pivot point at thebeginning of one stroke in the cycle of longitudinal reciprocation formoving the work laterally on the abrasive surface.

3. A machine as claimed in claim 2 wherein the means for moving the worklaterally comprises a laterally movable slide to which the work ispivotally connected, means for mounting the lateral slide on thelongitudinally reciprocable slide, and means attached to the mountingmeans and the lateral slide for actuating the latter upon the swingingof the work about its pivot point in one direction.

4. A machine as claimed in claim 1 wherein means is provided forprogressively rotating the work during each cycle of longitudinalreciprocation thereof, said means being actuated by the swinging of thework about its pivot point in one direction.

5. In a machine for truing plane surfaces on cylinder heads and blocksand on clutch pressure plates, the combination with an abrasive surfaceupon which the work to be ground rests, of a longitudinally reciprocableslide, means for reciprocating the slide, means attached to the slidefor holding the work pivotally from a point oiiset from its longitudinalcentre line, said work reciprocating longitudinally on the abrasivesurface with the longitudinal reciprocation of the slide, means actuatedby the swinging of the work about the pivot point at the beginning ofone stroke in the cycle of longitudinal reciprocation for moving thework laterally on the abrasive surface, and means for progressivelyrotating the work simultaneously with each lateral movement thereof onthe abrasive surface.

6. A machine as claimed in claim 2 wherein the means for moving the worklaterally comprises a laterally movable slide to which the work ispivotally connected, means for mounting the lateral slide on thelongitudinally reciprocable slide, means attached to the mounting meansand the lateral slide for actuating the latter upon the swinging of thework about its pivot point in one direction, a rotatable chuckincorporated in the work holding meansfor attaching the work thereto,and means on the lateral slide for progitudinal slide, a double armedmember pivotally connected to the lateral slide, means for attaching thework to the double armed member in such position that its longitudinalcentre line is offset laterally from the pivot of such double armedmember for permitting the work to swing a limited extent at thebeginning of each stroke of the longitudinal slide, and a crank pivotedon said lateral slide mounting means and operatively connected to thelateral slide for actuating the lateral slide and move the attached worklaterally at the beginning of one stroke of the longitudinal slide.

8. A machine for truing planesurfaces on cylinder heads and blocks andon clutch pressure plates comprising a table, an abrasive surface onsaid table upon which the work rests, a longitudinally movable slideonsaid table, means for reciprocating said slide, a laterally movableslide, means for mounting the lateral slide on said longitudinal slide,a double armed member pivotally connected to the lateral slide, meansfor attaching the work to the double armed member in such position thatits longitudinal centre line is offset laterally from the pivot of suchdouble armed member for permitting the work to swing a limited extent atthe beginning of each stroke of the longitudinal slide, a crank pivotedon said lateral slide mounting means and operatively connected to thelateral slide for actuating the lateral slide and move the attached worklaterally at the beginning of one stroke of the longitudinal slide, andresilient means on the lateral slide for exerting pressure on the workfor pressing it against the abrasive surface.

9. A machine as claimed in claim 7 wherein the lateral slide has a slottherethrough, and the double armed member has a lateral extension, and astud on the extension extending into the slot for limiting the swing ofthe double armed member and the attached work.

10. A machine as claimed in claim 7 wherein the lateral slide has a slottherethrough, and the double armed member has a lateral extension, astud on the extension extending into the slot for limiting the swing ofthe double armed member and the attached work, a ratchet wheel rotatablymounted on the slide, one end of the crank being pivotally connectedtothe ratchet wheel in the vicinity of its periphery, and a spring-heldpawl on the stud engageable with the ratchet wheel.

11. A machine as claimed in claim 8 wherein the means on the lateralslide for exerting pressure on the work comprises a bracket pivotallyconnected to the lateral slide and including a socket on its free end, avertical spindle threaded through the socket, a spring on the lower endof the spindle, and a pointed member on the spring adapted to engage thework.

12. A machine as claimed in claim 8 wherein a pivot pin extends throughthe slide for pivotally mounting the double armed member thereon, saidpin being non-rotatable in the member, a bracket non-rotatably mountedat one end on the pivot pin and including a socket on its free end, avertical spindle threaded through the socket, a spring on the lower endof the spindle, and a pointed member on the spring adapted to engage thework.

13. A machine as claimed in claim 7 wherein the means for attaching thework to the double armed member comprises a forked member, the legs ofwhich are secured to the arms of the double armed member, a rotatablechuck attached to the work and rotatably mounted on the forked member,and means in the lateral slide for progressively rotating the chuck ateach reciprocation of the longitudinal slide and attached work.

14. A machine as claimed in claim 7 wherein the means for attaching thework to the double armed member comprises a forked member, the legs ofwhich are secured to the arms of the double armed member, a rotatablechuck attached to the work and rotatably mounted on the stroke, movablemeans for moving said work laterall throughout a cycle ofreciprocations, and a member carried by said work and moving saidmovable means at each pivotal movement of said work.

16. In a machine for truing plane surfaces on cylinder heads and blocksand on clutch pressure plates, the combination with a base and anabrasive surface supported thereby, of means for holding the Work to beground in grinding position on said surface, means for reciprocatingsuch work relative to said base and longitudinally upon said surface,said reciprocating means including means movable laterally relative tosaid reciprocating means and connecting said work to said reciprocatingmeans, coacting means carried by said laterally movable means and saidreciprocating means and operative upon each longitudinal reciprocationto impart lateral movement to said work relative to said base, wherebysaid work is moved progressively across said surface in a lateraldirection upon successive cycles of longitudinal reciprocation, andmeans for simultaneously and progressively rotating said work upon saidsurface upon successive cycles of reciprocation thereof.

1'7. In a machine for truing plane surfaces on cylinder heads and blocksand on clutch pressure plates, the combination with a base and anabrasive surface supported thereby, of means for holding the work to beground in a grinding position on said surface, means for reciprocatingsaid work relative to said base and longitudinally upon said surface,said reciprocating means including means movable laterally relative tosaid reciprocating means,'offset pivotal meansconmeeting said work tosaid laterally movable means to permit oscillatory movement of said workin each cycle of reciprocation thereof, and co-acting means carried bysaid offset means, said laterally movable means and said reciprocatingmeans and operative upon the oscillatory movement of said work in atleast one direction to move said laterally movable means and said worklaterally 'of said surface.

13. Th machine of claim 17, and said co-acting means includingmeans forcontinuing said lateral movementof said work in a step-by-step mannerthroughout a pluralit of cycles of reciprocation of said work. 1 i

19. The machine of claim 1'7, and additional co-acting means carried bysaid offset means and said reciprocating means and operativeautoimparting step-by-step rotation to said article throughout saidcycle of reciprocations.

' JOHN CLARENCE INMAN.

